Does this include the CO2 emitted in the process of extracting and refining diesel/gasoline? Depending on the source of the oil (Canadian Tar sands vs Saudi Arabia), its carbon footprint can vary drastically.
To turn a barrel of tar sands oil into gasoline, for example, adds another ~230 pounds of CO2 to the atmosphere - in addition to the emissions from burning it. That's ~40 pounds/million BTU.
It almost costs us more energy to mine and refine tar sands oil, then we get out of burning it.